WO2015101695A1 - Capteur sans fil passif - Google Patents

Capteur sans fil passif Download PDF

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Publication number
WO2015101695A1
WO2015101695A1 PCT/FI2013/051214 FI2013051214W WO2015101695A1 WO 2015101695 A1 WO2015101695 A1 WO 2015101695A1 FI 2013051214 W FI2013051214 W FI 2013051214W WO 2015101695 A1 WO2015101695 A1 WO 2015101695A1
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WO
WIPO (PCT)
Prior art keywords
oscillator
passive wireless
resonator
rfid
wireless transponder
Prior art date
Application number
PCT/FI2013/051214
Other languages
English (en)
Inventor
Ville Viikari
Original Assignee
Metso Automation Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Automation Oy filed Critical Metso Automation Oy
Priority to CN201380081913.4A priority Critical patent/CN106031049B/zh
Priority to PCT/FI2013/051214 priority patent/WO2015101695A1/fr
Priority to KR1020167020551A priority patent/KR102101059B1/ko
Priority to EP13900820.5A priority patent/EP3090490B1/fr
Priority to US15/108,118 priority patent/US10140566B2/en
Publication of WO2015101695A1 publication Critical patent/WO2015101695A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0716—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
    • G06K19/0717—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor the sensor being capable of sensing environmental conditions such as temperature history or pressure
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07796—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements on the record carrier to allow stacking of a plurality of similar record carriers, e.g. to avoid interference between the non-contact communication of the plurality of record carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/45—Transponders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
    • H04Q2209/47—Arrangements in telecontrol or telemetry systems using a wireless architecture using RFID associated with sensors

Definitions

  • the present invention relates to passive wireless sensors.
  • Sensor is a device that transforms a measured quantity into a readable format, typically into an electrical signal.
  • sensors can be divided into wireless and wired sensors.
  • Wired sensors are connected via wiring harnesses or cable assemblies to a reader device.
  • Wireless sensors can be read without a physical connection to the sensor, and are often realized equipping the sensor with a radio transceiver.
  • the transmitted radio signal is interpreted by a receiver which converts the wireless signal into a desired output.
  • Wireless operation can be beneficial in many applications, where wired connection is difficult for example due to harsh operating conditions (like temperature and pressure, rotating parts, or cost and complexity of wiring.
  • wireless sensors also have some drawbacks such as limited lifetime due to battery, limited read-out distance due to attenuation and interference, security issues because of the uncontrollable propagation of the signal and potentially low speed of communication.
  • wireless sensors Based on the power source and communication principle, wireless sensors can be divided into three categories: active sensors, semi-passive sensors and passive sensors.
  • Active wireless sensors usually have both a radio transceiver and an on-board battery that is used to power up the transceiver. Active wireless sensors, having their own power sources, can use powerful transmitters and sensitive receivers. However, the battery on board limits the life time and also increases the size and weight. Due to more complex circuit, the price of an active sensor can be much higher than that of a passive sensor.
  • Semi-passive wireless sensors do not contain a radio transceiver, but are equipped with a battery.
  • the battery is used to power up an integrated circuitry (IC) and enables the sensors to operate independently of the reader device or to maintain memory in the sensor.
  • IC integrated circuitry
  • Semi-passive battery-assisted sensors utilize modulated backscattering technique for communication. This means that semi-passive sensors do not require any power from the on-board battery for transmission, but the sensor simply reflects back some of the power emitted by the reader device.
  • passive sensors Unlike the active and semi-passive sensors, passive sensors do not require an on-board battery. Therefore they can be less complex, smaller, more inexpensive, and their lifetime is not limited by the power supply.
  • the typical read-out distance of passive wireless sensors is between 10 cm and 3 m.
  • Passive wireless sensors can be divided into four main categories: radio frequency identification (RFID) tags, electrical resonance circuit sensors, surface acoustic wave (SAW), harmonic sensors and intermodulation sensors.
  • RFID radio frequency identification
  • SAW surface acoustic wave
  • SAW sensors utilize an interdigital transducer patterned on a piezoelectric substrate to convert the electromagnetic energy into a surface-acoustic wave (SAW).
  • SAW surface-acoustic wave
  • the SAW is then manipulated with acoustic reflectors, transformed back to electromagnetic energy, and radiated back to the reader device.
  • the measured quantity affects the propagation properties of the SAW on the piezoelectric substrate.
  • the need to use a piezoelectric material for the sensing element limits possible applications.
  • SAW tags only enable hard-coded identification (ID), and they do not provide any memory to the chip.
  • ID hard-coded identification
  • Resonance sensors consist of a simple resonance circuit, whose resonance is sensitive to a measured quantity. These sensors require near- field coupling to the reader, which limits their read-out distance to a few centimetres.
  • Harmonic sensors when illuminated by a reader with one or many tones, scatter back the sensor data at a harmonic frequency.
  • the sensor mixes the tones (nonlinearity is needed in order to set mixing) and reflects a signal containing harmonic products, which are offset from the reader frequencies.
  • the harmonic reader receives the harmonic of the transmitted frequencies, and the received data can then be processed to find the exact location and mobility of the object causing the generation of this harmonic.
  • the concept was first proposed for telemetry. Recently, an intermodulation com- munication principle for sensing applications has been developed. In this principle, the sensor is actuated by two closely located frequencies, and the sensor data is scattered back at an intermodulation frequency.
  • RFID is an identification technology that uses radio waves to communicate between tags and a reader and it is used to identify items. There are a few advantages of RFID over optical barcode identification such as no line- of-sight is required between the reader device and the tag, and the RFID reader can also read hundreds of tags at a time.
  • Passive RFID tags utilize the modulated backscattering communication principle which is illustrated in Figure 1 . When a tag 10 communicates with an RFID reader 1 1 , it modulates the re- ceived signal 12 and reflects a portion of it 13 back to the reader.
  • a typical passive tag consists of an antenna connected to an application specific microchip. When wirelessly interrogated by an RFID transceiver, or reader, the RFID tag antenna receives power and RF signals from the RFID reader and provides them to the chip.
  • the chip processes the signals and sends the requested data back to the RFID reader.
  • the backscattered signal is modulated according to the transmitted data.
  • the highest operation frequency and read-out distance of RFID are limited by the rectified power for the integrated circuit (IC) and are a few GHz and 5-10 m, respectively.
  • RFID is mostly used for identification.
  • RFID tags are equipped with a rewritable memory, which enables the reusability features of RFID tags, but they are not useful for measuring external quantities.
  • RFID has also been shown to be suitable for sensing by equipping an RFID tag with an external sensor and digital logic to read the external sensor. The advantage of this approach is that it would use a generic sensor element and thus would be well suited for a very broad range of applications.
  • an additional A/D converter and digital circuitry has to be included to the tag in order to enable sensor read-out. Increased power consumption due to the additional electronics reduces the read-out range significantly (e.g., from 10 m to 0.3 m with an 8-bit A/D converter).
  • An object of the present invention is to provide a passive wireless sensor that can provide sensing, sophisticated functionality, and large read-out distance.
  • An aspect of the invention is a passive wireless transponder, comprising an antenna, a rectifier, an oscillator and a modulator for communication with a backscattering principle to provide to radio frequency identification (RFI D) features, and a sensing element for sensing a predetermined variable, wherein the oscillator is a resonator- based oscillator (e.g., LC-oscillator, RLC- oscillator, crystal oscillator, MEMS resonator based oscillator), and the sensing element is connected to the oscillator, and a modulation frequency output from the oscillator is arranged to be dependent on a sensed value of the predeter- mined variable.
  • a resonator- based oscillator e.g., LC-oscillator, RLC- oscillator, crystal oscillator, MEMS resonator based oscillator
  • the transponder further comprises a control logic and/or a memory for radio frequency identification (RFI D) features, such as identification and anti-collision.
  • RFID D radio frequency identification
  • the transponder is implemented with an integrated circuit technique, and wherein the sensing element may be an external component, such as a MEMS sensor.
  • the sensing element may be an external component, such as a MEMS sensor.
  • resistive, capaci- tive, and inductive sensor elements can be used because they can all affect the resonance of an electrical resonator.
  • resistive sensors include temperature and strain sensors.
  • Inductive sensors include ultrasonic transduc- ers (can be inductive at certain excitation frequencies), proximity sensors, and inductive relays. Other variables, such as voltage or force can be transformed into a capacitance, for instance, using a varactor diode and piezoelectric material.
  • transponder is implemented with an integrated circuit technique, and wherein at least part of the oscillator comprises an external component, such as an external resonator, an external MEMS resonator, an external inductor.
  • an external component such as an external resonator, an external MEMS resonator, an external inductor.
  • transponder is implemented with an integrated circuit technique, and wherein the sensing element and a resonator part of the oscillator are implemented with a resonant sensors or a MEMS resonant sensor.
  • the oscillator can be a Collpitts oscillator, Meiss- ner oscillator, Armstrong oscillator, or Hartley oscillator.
  • more complex oscillator structures can be utilized.
  • the oscillator is loaded with many switchable sensor elements.
  • One sensor element can be selected to load the oscillator at a time and thus affect the oscillation frequency.
  • the transponder has a logical circuit that can switch on certain sensing element and switch off all the rest.
  • the reader device can send a command to the transponder on what sensor is switched on.
  • the LC or RLC oscillator is a Collpitts oscillator which comprises an active amplifying device, a capacitive divider, and a feedback inductance.
  • a voltage level of the modulation frequency output from the LC or RLC oscillator is dependent of a capacitive divider ratio of the capacitive divider.
  • the passive wireless transponder comprises one or more of a high pass filter between the antenna and the rectifier, a low pass filter between a DC output of the rectifier and an input of the oscillator, and a band pass filter between an output of the oscillator and an input of the modulator.
  • the rectifier comprises a rectifier diode D1 , and wherein the rectifier diode also provides a mixer of the modulator.
  • the modulated backscattered signal comprises sidebands that are offset from an interrogation frequency by the oscillation frequency which is dependent on the sensed value of the predetermined variable.
  • An aspect of the invention is a system comprising an RFID reader and at least one passive wireless transponder according to embodiments of the invention.
  • the passive wireless sensor concept according to embodiments of the invention can provide:
  • an external quantity such as pressure or acceleration
  • a generic, external sensing element e.g. a MEMS sensor
  • FIG 1 illustrates backscattering communication principle in an RFID system
  • Figure 2 is a functional block diagram illustrating an example of a an RFID tag architecture
  • Figure 3 is a circuit diagram illustrating an RC oscillator
  • Figure 4A illustrates an example of a LC oscillator
  • Figure 4B illustrates an example of a RFID sensor tag implemented with an integrated circuit chip and external components
  • Figure 4C illustrates an example of a RFID sensor tag provided with two or more sensing elements
  • Figure 5A is a system diagram that illustrates the communication principle for a RFID sensor according to exemplary embodiments of the invention.
  • Figure 5B is a spectral graph that illustrates the communication principle for a RFID sensor
  • FIG. 6 is a block and circuit diagram illustrating an RFID sensor device according to according to exemplary embodiments of the invention.
  • Figure 7 is a graph illustrating the oscillation output voltage as a function of input voltage supply.
  • FIG. 2 shows a functional block diagram illustrating an example of radio frequency identity (RFID) transponder (tag) architecture.
  • the RFID tag 10 may comprise an antenna 21 directly matched to the tag's front end impedance (matching circuit is not shown) to communicate with a RFID reader 1 1 ; an analogue RF front end that may typically contain rectifier circuitry 22 to convert RF power into a direct current (DC), a clock generator or oscillator 23, a modulator 24 and a demodulator 25.
  • the logic implementation usually follows a defined standard and a certain associated protocol.
  • memory storage 27 may be provided. Depending on a user's requirement, non-volatile memory storage may be needed if both read/write capability is implemented.
  • the passive RFID tags utilize the modulated backscattering principle for communication.
  • a tag communicates with a reader, it modulates the received signal and reflects a portion of it back to the reader.
  • the modulation frequency is the same as the clock frequency of the tag.
  • the clock frequency generation 23 is realized with an inefficient RC-oscillator whose frequency is relatively unstable. Therefore, a relatively large band (40 or 160 kHz, ⁇ 15%) is allocated for the modulated response of the tags.
  • the modulation frequency itself does not carry any information in current systems, and the spectral effi- ciency is poor (information band can be as low as one tenth of the overall band).
  • the RC-oscillator also consumes relatively large power.
  • An example of an RC oscillator containing a transistor M1 , a resistor R1 and a capacitor C1 is illustrated in Figure 3.
  • the unstable RC- oscillator in an RFID tag device is replaced with a stable resonator- based oscillator having a high Q value, and the RFID is provided with a sensor element in order to enable the sophisticated features of RFID and the possibility to measure external quantities without reducing the read-out distance.
  • resonator- based oscillators include Hartley, Collpits, Armstrong, and Meissner LC-oscillators or RLC-oscillators, different crystal oscillators, and oscillators based on MEMS (microelectro-mechanical systems), SAW (surface acoustic wave), and BAW (bulk acoustic wave) resonators.
  • Exemplary embodiments described herein for a LC-oscillator can be similarly applied to a RLC-oscillator. It should be appreciated that a LC-oscillator will become as a RLC-oscillator, if a minimal amount resistance R is introduced into the LC-oscillator. In practice, all LC-oscillators can be considered as RLC-oscillators, because there is always resistance R present in the inductor L. On the other hand, it is preferable to minimize the resistive component R, because the resistive component R increases the power consumption and reduces the read-out distance. The in- vention can also be used with an RC-oscillator with reduced measurement resolution. The advantage of an RC-oscillator is that it can be integrated.
  • the resonator-based oscillator first of all, enables a huge improvement to the spectral efficiency of the RFI D enabling simultaneous reading of numerous tags at different modulation frequencies (state-of-the-art readers already enable carrier frequency multi-access scheme, which should not be confused with the modulation frequency multi-access scheme). Furthermore, the resonator-based oscillator can be loaded with a sensing element which tunes the oscillation frequency, i.e. the oscillation frequency becomes sensitive to the measured quantity.
  • a passive RFI D sensor with a reso- nator-based oscillator and a sensor element is provided, wherein the oscillation frequency can be made dependent on the sensor element if sensing is required. Therefore, this concept is compatible for existing RFI D tags and can enable the possibility to measure external quantities without reducing the readout distance.
  • the resonator and sensor for example by designing a MEMS resonator in such a way, that its resonance is sensitive to a measured quantity.
  • the resonance frequency of a MEMS resonator can be made sensitive to temperature and strain and thus these parameters can be obtained from the resonance frequency.
  • an RFI D sensor tag can be interrogated with existing RFI D readers, because they already measure the clock frequency (that is, the modulation frequency) of the tag. No hardware modification is required to existing RFI D readers to communicate with a sensor RFI D according to embodiments of the invention.
  • RFI D sensor tags can also be equipped with external sensor elements without any reduction in the read-out distance.
  • the power consumption of an RFI D tag has slightly decreased when an RC-oscillator is replaced with an oscillator based on a resonator (e.g. LC, RLC, quartz crystal, SAW or BAW resonator or MEMS resonator).
  • FIG. 4A An example of a resonator-based LC oscillator containing a transis- tor M1 and an LC resonator 41 with a parallel connection of inductor L1 and a capacitor C2 is illustrated in Figure 4A.
  • Figure 4B illustrates an example of a RFID sensor tag wherein the normal RFID circuits and functions (such as rectifier 22, modulator 24, logic 26 and memory 27) as well as part of the clock generator 23 (such transistor M1 and capacitor C1 ) are implemented on an integrated circuit chip 43, whereas part of the oscillator 23 (such an inductor L1 or a resonator) and a sensing element 42 (such capacitive sensor Cs) may be implemented as external components connected to the integrated circuit chip 43. Alternatively, the entire resonator (such as the resonator 41 ) may be implemented with one or more external components, or some other kind of configuration may be employed.
  • the concept allows utilizing potentially low-cost inductors, resonators and sensors or resonant sensors.
  • MEMS resonators and sensor or MEMS resonant sensors may be applicable.
  • MEMS resonant sensor is a resonating device, whose resonance is made sensitive to a measured quantity. The measured quantity is obtained by measuring the resonance of the device.
  • the cost of MEMS resonators and sensors is in the range of 0.5 - 2 €, and that of mass produced RFID chips around 0.1 €.
  • mass produced high frequency (HF) and near-field-communication (NFC) RFID tags with a sensor interface costs $2.59-3.46.
  • FIG. 4C illustrates an example of a transponder or a RFID sensor tag provided with two or more sensing elements 42-1 , 42-2, ... , 42-N.
  • the RFID sensor tag may include normal the normal RFID circuits and functions (such as rectifier 22, modulator 24, logic 26 and memory 27) as well as a resonator-based clock generator or oscillator 23, such as those described in other exemplary embodiments.
  • Sensing elements 42-1 , 42-2, ... , 42-N can be selectively, one at time, enabled to load the oscillator 23 such that the modulation frequency output from the oscillator 23 is dependent on a sensed value of the predetermined variable of the enabled sensing element 42.
  • one sensing element can be selected to load the oscillator at a time and thus affect the oscillation frequency.
  • the transponder may have a logi- cal circuit that can switch on certain sensing element and switch off all the rest.
  • the transponder may comprise a selector 44, such as a switch circuit or an analog multiplexer arranged to selectively connect one and disconnect the remaining ones of the plurality of sensing elements 42-1 , 42-2, ... , 42-N to and from the oscillator 23.
  • the selective enabling, switching or connecting may be carried out according to a predetermined sequence.
  • a reader device can send a command to the transponder on which sensing element 42-1 , 42-2, 42-N is switched on.
  • the logic 26 may receive a selection command from the reader and control the selector 44 ac- cordingly.
  • Figs. 5A and 5B illustrate the communication principle for a RFID sensor according to exemplary embodiments of the invention.
  • f C w and fosc represent the carrier frequency and oscillation frequency, respectively.
  • the RFID sensor is actuated using an RF CW signal transmitted from the reader 1 1 .
  • the RF signal is converted to DC voltage by a rectifier 22 (such as rectifier 22 in Fig. 4B).
  • the rectified voltage powers up an oscillator 23, which produces a low frequency sinusoid fosc at its output.
  • the oscillation signal fosc is fed to the modulator 24 to realize the backscattering principle.
  • the modulator 24 modulates the signals, and those going back to the antenna 21 depend on the matching between the antenna and the rectifier 21 /modulator 24. As a consequence, there are sidebands few - fosc and few + fosc in the signal reflected from the sensor. The sidebands are offset from the carrier f C w by the oscillation frequency fosc-
  • an antenna 21 matched to the rectifier 22 with a suitable matching circuit as well known to a person skilled in the art.
  • a high pass filter 51 between the antenna 21 and the rectifier 22, a low pass filter 52 between the DC output of the rectifier 21 and the input of the low-frequency oscillator 23, and a band pass filter 53 between the output of the oscillator 23 and the input of the modulator 24.
  • a passive RFID sensor 50 typically harvest all the energy needed for its operation from the interrogation signal of the reader device 1 1 .
  • energy harvesters include photovoltaic and solar cells, thermocouples, vibration energy harvesters, wind turbines (also in microscopic level) and acoustic harvesters.
  • the reader device 1 1 illuminates the tags with a continuous wave (CW), and the RFID sensors utilize a voltage rectifier 22 to produce the supply voltage V D c needed for the operation. Under small-signal conditions, in which the RFID sensors often operate at large distances, the efficiency of the rectifier is proportional to the peak AC voltage.
  • Rectifier 22 may be based on a non-linear element, such as a diode D1 , and it is used to convert AC voltage into DC.
  • a most simple rectifier may contain a zero bias Schottky diode D1 .
  • the antenna 21 may be isolated from the rectifier diode D1 with high pass filter 51 , such as a DC block capacitance, and the oscillator 23 may be isolated from the antenna 21 and the rectifier 22 at RF with the low pass filter 52, such as an RF choke, in order to prevent RF energy from dissipating in the DC load, i.e. in the oscillator 23.
  • the sensor utilizes the modulated backscattering principle for communication.
  • the modulated backscattering may be realized by applying the oscillator output fosc to the rectifier 22.
  • rectifier diode D1 is also used as a part of the modulator 24.
  • the rectifier diode D1 is used as a mixer.
  • the band-pass filter 63 such as an RF choke, allows the oscillator frequency to fosc pass through and stop other frequencies.
  • the oscillation signal fosc modulates the RF impedance of the rectifier diode D1 .
  • the voltage at the oscillation frequency fosc mixes with the original input frequency few, generating signals at the sum (f C w + fosc ) and difference (few - fosc) frequencies. As a consequence, there are sidebands in the signal reflected from the sensor 50.
  • the reflected power by the RFID sensor depends on the diode parameters, RFID sensor input power (V D c), oscillator output voltage V osc and the internal resistance of the antenna 21 , for example.
  • an oscillator 23 When used in a passive wireless sensor, an oscillator 23 must pro- prise a large output voltage and its power consumption must be small.
  • the power consumption of an RFID sensor 50 mainly takes place in the oscillator circuit 23 to generate the oscillator output voltage, on which the sensor readout distance depends. Therefore, power consumption of an RFID sensor 50 can be made arbitrary small by designing an oscillator which can operate with ultra-low supply voltage. Moreover, larger read-out distance of the RFID sensor 50 can be achieved by producing a large oscillator output voltage.
  • the pre- vious analysis was made under an assumption that the sensor is not equipped with digital IC electronics. When digital electronics are included, the read-out distance may be limited due to the power consumption of the digital circuitry.
  • Oscillator circuit 23 can be implemented with various oscillator to- pologies. Examples of classic oscillator topologies include Collpitts oscillator, Meissner oscillator, Armstrong oscillator, and Hartley oscillator.
  • the Colpitts oscillator is perhaps the most widely used oscillator in the history, widely used in commercial signal generators up to 100 MHz and also because it is easy to implement. In exemplary embodiments a simple Colpitts oscillator topology has been chosen for description without intending to restrict the invention to this oscillator topology.
  • the exemplary oscillator 23 may be implemented by a low voltage Colpitts oscillator.
  • the exemplary oscillator circuit contains common-gate amplifier, including a transistor M1 , a capacitive divider composed of capacitors C1 and C2, and a feedback inductor L1 .
  • the power consumption of an oscillator depends heavily on the semiconductor fabrication process and transistor technology type. Common processes are silicon (Si), gallium arsenide (GaAs) and silicon germanium (SiGe). Typical technologies used are bipolar junction transistor (BJT), field- effect transistor (FET) and heterojunction bipolar transistor (HBT). The power consumption of an oscillator also depends on the bias circuit and threshold voltage of the transistor.
  • the metal-oxide-semiconductor field-effect transistor (MOSFET) is a type of field-effect transistor (FET). As compared to BJTs, a MOSFET can be made quite small and its operation requires relatively low power. Therefore, in the exemplary embodiments, a MOSFET transistor M1 with a very low threshold voltage, such as ALD 800, may be employed.
  • the control terminal of MOSFET transistor M1 are connected to the supply voltage V D c directly, the drain terminal is connected to the supply voltage V D c via the feedback inductor L1 , and the source terminal is connected to the ground via a series connection of the inductor L2 and the biasing resistance Rbias-
  • the sensing element 42 may provide a load resistance RL at the output of the oscillator.
  • the required feedback may be achieved with a capacitive divider formed by a series connection of the capacitors C1 and C2 connected between the drain terminal and the ground.
  • the middle node between C1 and C2 is connected to the source terminal and provides the output of the oscillator.
  • the capacitive divider C1 -C2 determines ratio between the oscillator voltages V D c and V 0S c.
  • Figure 7 illustrates the oscillation output voltage as a function of input voltage supply with parameter values listed in Table 1 below and with the aim of generating a signal at 100 kHz.
  • the oscillator required a minimum supply voltage of 4 mV to start the oscillation which makes it feasible for use in a passive wireless sensor.
  • Bias inductor l_2 10 mH
  • Capacitor d 3.3 nF
  • Capacitor C 2 16 nF
  • the power consumption of an oscillator can be made arbitrarily low by decreasing the capacitive divider ratio and increasing the quality factor (Q) of the feedback inductor. It is found out that the rectified DC voltage depends on the diode parameters, input power and load impedance. Oscillator output voltage depends on the rec- tified DC voltage, oscillator circuit topology, and quality factor and characteristic impedance of the resonator. Moreover, power consumption by an oscillator can be made arbitrarily small by decreasing the capacitive divider ratio. Furthermore, modulated reflected power of the sensor depends on mixer diode parameters, input power of the sensor and output voltage of the oscillator.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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  • Near-Field Transmission Systems (AREA)

Abstract

L'invention concerne une étiquette à capteur RFID qui peut comprendre des circuits et fonctions RFID normaux (tels que redresseur 22, modulateur 24, logique 26 et mémoire 27) ainsi qu'un générateur d'horloge ou oscillateur (23) à base de résonateur. L'oscillateur (23) est un oscillateur à base de résonateur stable ayant une valeur Q élevée. L'oscillateur à base de résonateur (23) est chargé avec un élément sensible (42) qui accorde la fréquence d'oscillation, c'est-à-dire que la fréquence d'oscillation est sensible à la grandeur mesurée. Un capteur RFID passif comportant un oscillateur à base de résonateur et un élément capteur est ainsi obtenu, dont la fréquence d'oscillation peut être rendue dépendante de l'élément sensible si une détection est requise. Le concept est compatible avec des étiquettes RFID existantes et peut offrir la possibilité de mesurer des grandeurs externes sans réduire la distance de lecture.
PCT/FI2013/051214 2013-12-30 2013-12-30 Capteur sans fil passif WO2015101695A1 (fr)

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CN201380081913.4A CN106031049B (zh) 2013-12-30 2013-12-30 被动无线传感器
PCT/FI2013/051214 WO2015101695A1 (fr) 2013-12-30 2013-12-30 Capteur sans fil passif
KR1020167020551A KR102101059B1 (ko) 2013-12-30 2013-12-30 수동형 무선 센서
EP13900820.5A EP3090490B1 (fr) 2013-12-30 2013-12-30 Capteur sans fil passif
US15/108,118 US10140566B2 (en) 2013-12-30 2013-12-30 Passive wireless sensor

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016107976A1 (fr) * 2014-12-30 2016-07-07 Teknologian Tutkimuskeskus Vtt Oy Détection sans fil passive avec identification
US9613237B2 (en) 2014-09-03 2017-04-04 Metso Flow Control Oy Passive RFID sensor tag
US9779342B2 (en) 2014-09-03 2017-10-03 Metso Flow Control Oy RFID reading method and RFID reader
ITUA20163901A1 (it) * 2016-05-10 2017-11-10 Piero Tognolatti Sistema e metodo per la misura di fenomeni fisici basato su dispositivo senza fili
CN107516054A (zh) * 2016-06-17 2017-12-26 南京理工大学 可任意组网的射频识别无源无线谐振传感器结构及系统
CN107516119A (zh) * 2016-06-17 2017-12-26 南京理工大学 一种无线查询的无源谐振传感器标签
JP2018009979A (ja) * 2016-07-12 2018-01-18 パロ・アルト・リサーチ・センター・インコーポレーテッドＰａｌｏ Ａｌｔｏ Ｒｅｓｅａｒｃｈ Ｃｅｎｔｅｒ Ｉｎｃｏｒｐｏｒａｔｅｄ パッシブセンサタグシステム
WO2018153616A1 (fr) * 2017-02-26 2018-08-30 Iq-Mobil Gmbh Transpondeur à démodulateur à haute fréquence optimisé pour le fonctionnement mixte analogique-numérique
US10114987B2 (en) 2014-07-07 2018-10-30 Metso Oyj Adaptive RFID reader
US10210445B2 (en) 2014-09-03 2019-02-19 Metso Flow Control Oy Passive RFID sensor tag and RFID reader
US10461973B2 (en) 2015-06-03 2019-10-29 Metso Oyj Passive RFID sensor tag
GB2615591A (en) * 2022-02-14 2023-08-16 Pragmatic Semiconductor Ltd Sensor system and methods

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015008412A1 (de) * 2015-07-02 2017-01-05 Ika-Werke Gmbh & Co. Kg Vorrichtung zum Bearbeiten eines Mediums mit Drahtlosmodul
US11497964B1 (en) * 2015-09-17 2022-11-15 Canary Medical Switzerland Ag Devices, systems and methods for using and monitoring sports equipment and sports activities
EP3171291B8 (fr) * 2015-11-20 2019-02-20 pro-micron GmbH Procédé et dispositif d'interrogation de données provenant d'un élément passif
WO2017200117A1 (fr) * 2016-05-17 2017-11-23 한빛이디에스(주) Appareil de mesure de température sans fil utilisant un dispositif à ondes acoustiques de surface
US10224757B2 (en) 2016-12-28 2019-03-05 Texas Instruments Incorporated Methods and apparatus for antenna signal limiter for radio frequency identification transponder
US9729359B1 (en) * 2016-12-28 2017-08-08 Texas Instruments Deutschland Gmbh Methods and apparatus for transponder oscillator with optimized timing
US9762282B1 (en) 2017-03-15 2017-09-12 Texas Instruments Deutschland Gmbh Integrated circuits and transponder circuitry with improved ask demodulation
US10038579B1 (en) 2017-03-15 2018-07-31 Texas Instruments Incorporated Integrated circuits and transponder circuitry with shared modulation capacitor for 3D transponder uplink modulation
US10395162B1 (en) * 2017-06-03 2019-08-27 Georgios Vougioukas Ultra-low power and cost purely analog backscatter sensors with extended range smartphone/consumer electronics FM reception
EP3815229A1 (fr) * 2018-07-01 2021-05-05 Friedrich-Alexander-Universität Erlangen-Nürnberg Composants anti-brouillage électromagnétique
IT201800008047A1 (it) * 2018-08-10 2020-02-10 Mole Abrasivi Ermoli Srl Sistema di molatura comprendente una molatrice e una mola e metodo per scambiare informazioni tra molatrice e mola
DE102018213730A1 (de) * 2018-08-15 2020-02-20 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Passiv arbeitender Transponder mit sensitiver Funktionalität
JP7172411B2 (ja) * 2018-10-11 2022-11-16 セイコーエプソン株式会社 リアルタイムクロック装置、電子機器及び移動体
FR3090887B1 (fr) * 2018-12-21 2020-12-04 Commissariat Energie Atomique Systeme de detection d’une evolution d’un parametre environnemental
US10635868B1 (en) * 2019-01-10 2020-04-28 Samsung Electronics Co., Ltd. Sensor system using stretchable antenna
DE102019116636A1 (de) * 2019-06-19 2020-12-24 Fraba B.V. Sensorvorrichtung und Fluiddurchfluss-Messanordnung mit einer derartigen Sensorvorrichtung
DE102020111854A1 (de) * 2019-06-26 2020-12-31 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Verfahren und Anordnung zum Aufschreiben von Software und/oder Firmware auf einen programmierbaren integrierten Schaltkreis
WO2020264242A1 (fr) * 2019-06-26 2020-12-30 The Board Of Trustees Of The University Of Illinois Instrument de détection de masse
CN110426064B (zh) * 2019-07-18 2021-07-20 东南大学 无线无源传感器及无线无源传感方法
CN113994343A (zh) * 2019-08-02 2022-01-28 阿尔卑斯阿尔派株式会社 通信系统以及信息终端机
US10998958B1 (en) 2019-11-22 2021-05-04 Raytheon Technologies Corporation Radio frequency-based repeater in a waveguide system
US11277676B2 (en) * 2019-11-22 2022-03-15 Raytheon Technologies Corporation Radio frequency system sensor interface
US10826547B1 (en) 2019-11-22 2020-11-03 Raytheon Technologies Corporation Radio frequency waveguide communication in high temperature environments
DE102020200953B4 (de) 2020-01-27 2021-09-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Optimierte Datenübertragung für UHF-Transponder
CN111307191A (zh) * 2020-02-21 2020-06-19 河海大学 一种声屏障螺栓松动快速检测方法
US11474781B2 (en) * 2020-06-10 2022-10-18 Asianlink Technology Incorporation Electronic book system using electromagnetic energy to detect page numbers
US11954555B2 (en) * 2020-07-30 2024-04-09 Nisshinbo Micro Devices Inc. Sensor interface circuit and sensor module
CN112132247B (zh) * 2020-09-03 2022-10-21 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) 一种低功耗低成本的温度传感无源标签集成电路
CN113283565B (zh) * 2021-06-02 2024-01-26 上海宜链物联网有限公司 一种rfid标签芯片天线阻抗自动调谐系统及方法
US20230014988A1 (en) * 2021-07-16 2023-01-19 DePuy Synthes Products, Inc. Smart plate sensors

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050093688A1 (en) * 2003-10-30 2005-05-05 Sinnett Jay C. Acoustic wave device with digital data transmission functionality
US20070182549A1 (en) * 2006-01-30 2007-08-09 Baohua Qi RFID sensor device based on pulse-processing
US20070222590A1 (en) * 2006-03-22 2007-09-27 Joshua Posamentier Passive environmental RFID transceiver
US20120275489A1 (en) * 2009-11-05 2012-11-01 Teknologian Tutkimuskeskus Vtt Method for temperature measurement

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997045277A1 (fr) * 1996-05-29 1997-12-04 Bartels Mangold Electronic Gmbh Dispositif de transmission sans fil a partir d'elements mobiles
US6480699B1 (en) * 1998-08-28 2002-11-12 Woodtoga Holdings Company Stand-alone device for transmitting a wireless signal containing data from a memory or a sensor
CN100530227C (zh) * 2003-08-29 2009-08-19 赛宝技术公司 具有可选择的反向散射参数的rfid系统
US7026935B2 (en) * 2003-11-10 2006-04-11 Impinj, Inc. Method and apparatus to configure an RFID system to be adaptable to a plurality of environmental conditions
JP4328705B2 (ja) * 2004-02-27 2009-09-09 均 北吉 Ｒｆｉｄタグ装置
DE102004062132A1 (de) * 2004-12-23 2006-07-13 Atmel Germany Gmbh Backscatter Transponder
US20070090926A1 (en) * 2005-10-26 2007-04-26 General Electric Company Chemical and biological sensors, systems and methods based on radio frequency identification
JP2010154195A (ja) 2008-12-25 2010-07-08 Alps Electric Co Ltd 無線通信方法およびトランスポンダ
FI20105330A0 (fi) 2010-03-31 2010-03-31 Valtion Teknillinen Epälineaarinen resonoiva anturi ja menetelmä
CN102338669B (zh) * 2010-05-27 2014-08-06 香港科技大学 低电压低功耗cmos温度传感器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050093688A1 (en) * 2003-10-30 2005-05-05 Sinnett Jay C. Acoustic wave device with digital data transmission functionality
US20070182549A1 (en) * 2006-01-30 2007-08-09 Baohua Qi RFID sensor device based on pulse-processing
US20070222590A1 (en) * 2006-03-22 2007-09-27 Joshua Posamentier Passive environmental RFID transceiver
US20120275489A1 (en) * 2009-11-05 2012-11-01 Teknologian Tutkimuskeskus Vtt Method for temperature measurement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3090490A4 *

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US9613237B2 (en) 2014-09-03 2017-04-04 Metso Flow Control Oy Passive RFID sensor tag
US9779342B2 (en) 2014-09-03 2017-10-03 Metso Flow Control Oy RFID reading method and RFID reader
US10210445B2 (en) 2014-09-03 2019-02-19 Metso Flow Control Oy Passive RFID sensor tag and RFID reader
WO2016107976A1 (fr) * 2014-12-30 2016-07-07 Teknologian Tutkimuskeskus Vtt Oy Détection sans fil passive avec identification
US10461973B2 (en) 2015-06-03 2019-10-29 Metso Oyj Passive RFID sensor tag
ITUA20163901A1 (it) * 2016-05-10 2017-11-10 Piero Tognolatti Sistema e metodo per la misura di fenomeni fisici basato su dispositivo senza fili
CN107516119A (zh) * 2016-06-17 2017-12-26 南京理工大学 一种无线查询的无源谐振传感器标签
CN107516054A (zh) * 2016-06-17 2017-12-26 南京理工大学 可任意组网的射频识别无源无线谐振传感器结构及系统
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JP2018009979A (ja) * 2016-07-12 2018-01-18 パロ・アルト・リサーチ・センター・インコーポレーテッドＰａｌｏ Ａｌｔｏ Ｒｅｓｅａｒｃｈ Ｃｅｎｔｅｒ Ｉｎｃｏｒｐｏｒａｔｅｄ パッシブセンサタグシステム
JP7019930B2 (ja) 2016-07-12 2022-02-16 パロ・アルト・リサーチ・センター・インコーポレーテッド パッシブセンサタグシステム
WO2018153616A1 (fr) * 2017-02-26 2018-08-30 Iq-Mobil Gmbh Transpondeur à démodulateur à haute fréquence optimisé pour le fonctionnement mixte analogique-numérique
US10958490B2 (en) 2017-02-26 2021-03-23 IQ-Mobile GmbH Transponder with high-frequency demodulator optimized for analog-digital mixed operation
GB2615591A (en) * 2022-02-14 2023-08-16 Pragmatic Semiconductor Ltd Sensor system and methods

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US20160328637A1 (en) 2016-11-10
EP3090490A1 (fr) 2016-11-09
KR20160105454A (ko) 2016-09-06
EP3090490B1 (fr) 2019-09-11
CN106031049B (zh) 2019-06-25
US10140566B2 (en) 2018-11-27
CN106031049A (zh) 2016-10-12
KR102101059B1 (ko) 2020-05-27
EP3090490A4 (fr) 2017-08-23

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